Heat-exchanger



R. W, DOUGLASS.

HEAT EXCHANGER.

APPLICA'I'ION FILED JULY 27. I920.

1,397,91 m Patented Nov. 15, 1921.

STATES RICHARD W. DOUGLASS, OF WEST NEW BRIGHTON, NEl/V YORK, ASSIGNURT0 HTGElEt- SOIL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CURPORATIOND1 NEW JERSEY.

HEAT- EXGHANG-ER.

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Application filed July 27,

To a 107mm if may concern.

Be it known that I, RICHARD WV. DoUeLAss, a citizen of the UnitedStates, residing at 'est New Brighton, Staten Island, in,the county ofRichmond and State of New York, have invented certain new and usefulImprovements in Heat-Exchangers, of which the following is aspecification.

This invention relates to heat exchangers and particularly to a deviceof this character adaptable for use in unitary apparatus for compressingair or gas, and the primary object of the invention is to produce dryhot compressed air or gas for industrial pur poses.

Another object of the invention is to enable a heat exchanger toaccomplish the above by a regenerative method in which cooled dried airor gas is continuously heated, while at the same time the hot compressedair or gas is initially cooled, by transfer of heat from the hotcompressed air or gas to the dried cooled air or gas.

A further object is to accomplish the above by a simple device embodyingbut few parts and which may be applied to existing air compressorinstallations without requirihg more than a slight rearrangement of thepiping.

One preferred form of apparatus for carrying out the invention is shownin the accompanying drawing which is a diagrammatic side elevationpartly in longitudinal section of such apparatus.

Referring to the drawing, a compressorA of any suitable form having'thereciprocating piston B, is connected by a pipe C to a heat exchanger orregenerator D shown in this instance in the form of a cylinder throughwhich the compressed air pipe E leads to the pipe F connected to anaftercooler G of any suitable form in which the air or gas is cooled.From the aftercooler G the air or gas passes through the pipe H to thereceiver J in which the moisture is substantially removed and fromthence the pipe K leads back to the inlet L in the heat exchangercylinder D so that the drled cooled air passes over and around thecompressed air pipe E through the cylinder D to the outlet 0, which islocated at a point remote from the inlet L, from which outlet 0 dry hotcompressed air may be piped to the Specification of Letters Patent.

Patented Nov. 115, 1921i.

1920. Serial No. 399,294.

work. The regenerator embodies in fact a concentric arrangement of theportion of the passage leading from the compressor to the aftercoolerwith a portion of the outlet passage, the concentric portion oftheoutlet passage being of increased diameter so that it forms acylindrical casing with a chamber around the first named passage.

The cylinder or reheater casing D is constructed in novel and simpleform. As shown it comprises two cylindrical sections P and havingflanged ends R and S respectively adapted to be bolted or otherwisesecured together at T to form the unitary casing D. The inlet L ispositioned at the side .of the section Q at a oint remote from the jointT and the outlet is similarly located at the side of the section P at apoint remote from the joint T. The outer end of the section T isindented forming a cavity and is provided with an aperture V throughwhich the pipe C passes. Packing W is placed in the cavity U around thepipe C and a gland X longitudinally movable in the cavity U is arrangedto hold the acking W compressed. around the pipe form a tightjointpreventing the escape of air from the interior of the casing D. At

and r the outer end of the section Q is an aperture Y through which thepipe C also passes.

A flange Z on the pipe C inside the casing .l) abuts against the innerface of the outer end of the section Q and a similar flange a on thepipe C outside of the casing D abuts against the outer face of the outerend of the 4 direction to the flow of the hot compressed air or gas andthe cooled dried air or gas is continuously and regeneratively finallyheated while at the. same time the hot compressed air or gas isinitially cooled by trans fer of heat from the hot compressed an or g inp p E to h cooled dried air or gas in the cylinder D,

The apparatus is simple and cheap to manufacture and owing to theregenerative principle employed is economical in operation. I

I claim-.

1. In a heat exchanger for simultaneously and continuously cooling a hotmedium and heating an oppositely flowing cool medium by heat interchangebetween said mediums, a single pipe for conveying one medium, a casingsurrounding said pipe, said casing having an inlet and an outlet locatedat points remote from each other and being adapted to cause flow of asecond medium at a different temperature through the casing and alongand around the pipe conveying the first named medium in a directioncounter to the flow of said first named medium, said conveying pipehaving flanges abutting against the inner and outer faces of one end ofthe casing said flanges securing the end of the casing to preventleakage and also preventing relative longitudinal movement between saidpipe and casing, the opposite end of the casing adjacent the outlethaving a packed joint around the discharge pipe to prevent leakage fromthe easing at said end.

2. In aheat exchanger for simultaneously and continuously cooling hotmoist air or gas and reheating cooled dried air or gas by heatinterchange between said mediums, a pipe for conveying one medium, acasing surrounding said pipe for a substantial por- .tion of its length,said casing being composed of a plurality of sections and having aninlet and an outlet respectively in said sections said inlet and outletbeing located at points remote from each other and being adapted tocause flow of another medium at a different temperature through theeasing and along and around the conveying pipe for the first medium in adirection counter to the flow of said first named medium, said conveyingpipe having a flange abutting against the inner end of one of the casingsections and a flange abutting against the outer end of said casingsection, said flanges securing the end of the casing to prevent leakageand also preventing relative longitudinal movement between said pipe andcasing, the opposite end of the casing adjacent the outlet having apacked joint around the conveying pipe to prevent leakage from thecasing at said end.

In testimony whereof I have signed this specification.

RICHARD W. DOUGLASS.

